【摘要】：隨著修建隧道數(shù)量的日益增多,隧道穿越軟弱圍巖地層時(shí)遇到的大變形災(zāi)害問題日益突出,經(jīng)常有初支變形過大、開裂,甚至二襯開裂掉塊的現(xiàn)象發(fā)生。本文以關(guān)埡子隧道工程為背景,采用現(xiàn)場(chǎng)調(diào)查、室內(nèi)試驗(yàn)、理論分析、監(jiān)控量測(cè)和數(shù)值模擬的手段,研究了極高地應(yīng)力下軟弱絹云母千枚巖大變形的機(jī)理,并確定了關(guān)埡子隧道的最優(yōu)施工方法。主要結(jié)論如下：1、分析了關(guān)埡子隧道圍巖的礦物成分,并確定了圍巖的力學(xué)參數(shù),以此判定關(guān)埡子隧道圍巖屬于極高地應(yīng)力狀態(tài)下的軟弱圍巖。2、結(jié)合關(guān)埡子隧道現(xiàn)場(chǎng)監(jiān)控量測(cè)數(shù)據(jù),對(duì)隧道大變形段的變形規(guī)律進(jìn)行了總結(jié)分析,該隧道具有徑向變形明顯,變形的不對(duì)稱性,變形時(shí)間長(zhǎng)、收斂慢,變形量大、變形速度快、變形范圍廣的特征。并從地質(zhì)構(gòu)造、圍巖巖性、地應(yīng)力、地下水及施工方法等方面探討了該隧道發(fā)生大變形的機(jī)理。3、采用數(shù)值模擬的方法,從變形控制、支護(hù)結(jié)構(gòu)受力等方面對(duì)三臺(tái)階七步法、預(yù)留核心土臺(tái)階法、CRD法、雙側(cè)壁導(dǎo)坑法和新意法進(jìn)行了對(duì)比分析,確定了新意法是最適合關(guān)埡子隧道的施工方法,并從變形控制、支護(hù)結(jié)構(gòu)受力及其安全系數(shù)幾個(gè)方面對(duì)新意法進(jìn)行了改進(jìn)優(yōu)化,得出了對(duì)掌子面進(jìn)行全斷面超前加固分臺(tái)階開挖,加固區(qū)長(zhǎng)15m、一次開挖進(jìn)尺1 m為最適合關(guān)埡子隧道的施工方法。
[Abstract]:With the increasing number of tunnels, the problem of large deformation disasters encountered in tunnels passing through soft surrounding rock is becoming more and more serious. The phenomenon of excessive deformation of initial branches, cracking and even cracking of the second lining often occurs. In this paper, the mechanism of large deformation of soft sericite phyllite under extremely high ground stress is studied by means of field investigation, laboratory test, theoretical analysis, monitoring measurement and numerical simulation. The optimal construction method of Guanyazi Tunnel is determined. The main conclusions are as follows: 1. The mineral composition of the surrounding rock of Guanyazi Tunnel is analyzed, and the mechanical parameters of the surrounding rock are determined. Based on this, it is determined that the surrounding rock of Guanyazi Tunnel belongs to the weak surrounding rock of extremely high ground stress. Combined with the monitoring data of Guanyazi Tunnel, the deformation law of the large deformation section of the tunnel is summarized and analyzed. The tunnel has obvious radial deformation. Asymmetry of deformation, long deformation time, slow convergence, large amount of deformation, fast deformation speed and wide range of deformation. The mechanism of large deformation of the tunnel is discussed from geological structure, surrounding rock lithology, in-situ stress, groundwater and construction method. The three-step and seven-step method is used to control deformation and force of supporting structure by numerical simulation. By comparing and analyzing the CRD method, double sidewall guide pit method and Xinyi method, it is determined that Xinyi method is the most suitable construction method for Guanyazi tunnel, and the deformation control is also carried out from the point of view of deformation control. This paper improves and optimizes the Xinyi method in several aspects of the force and safety factor of the supporting structure, and obtains the excavation of step by step for the full section advance reinforcement of the face. The construction method of Guanya-Zi tunnel is that the reinforcement area is 15m and the excavation advance is 1 m at a time.
【學(xué)位授予單位】：西南交通大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：U455.49

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